求翻译：进入21世纪，汽车污染日益成为全球性问题。随着汽车数量越来越多、使用范围越来越广，它对世界环境的负面效应也越来越大，尤其是危害城市环境，引发呼吸系统疾病，造成地表空气臭氧含量过高，使城市环境转向恶化。有关专家统计，到21世纪初，汽车排放的尾气占了大气污染的30～60%。随着机动车的增加，由局部性转变成连续性和累积性，而各国城市市民则成为汽车尾气污染的直接受害者。是什么意思？

In the 21st century, automobile pollution is increasingly becoming a global problem. With the increasing number of cars using the increasingly wide range of negative environmental effects of its world is also growing, especially in urban environment is hazardous, causing respiratory diseases, result

In the 21st century, motor vehicle pollution is increasingly becoming a global problem. With increasing number of cars, it has become an increasingly widespread, scope of use of the world's environment has become increasingly negative effects, in particular, urban environment, respiratory diseases,

Enters for the 21st century, the auto pollution becomes the global question day by day.Are more and more many along with the automobile quantity, the use scope is more and more broad, it more and more is also big to the world environment negative effect, harms the urban environment in particular, th

Entering the 21st century, car pollution increasingly becoming global problem. More and more as the number of cars, use an increasingly widespread, its negative effects on the world environment is also growing, especially against the urban environment, causing respiratory diseases, causing surface a

Entering the 21st century, car pollution increasingly becoming global problem. More and more as the number of cars, use an increasingly widespread, its negative effects on the world environment is also growing, especially against the urban environment, causing respiratory diseases, causing surface a